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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - The effect of centrifugal buoyancy on the heat transport in rotating Rayleigh-B'enard convection
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - The effect of centrifugal buoyancy on the heat transport in rotating Rayleigh-B'enard convection

机译：APS-APS流体动力学分部第70届年会-事件-旋转浮力对流瑞利-贝纳德对流中离心浮力对传热的影响

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In a rapidly rotating and differentially heated fluid, the centrifugal acceleration can play a similar role to that of gravity in generating convective motion. However, in the paradigm system of rotating Rayleigh-B'enard convection, centrifugal buoyancy is typically not considered in theoretical studies and, thus, usually undesired in laboratory experiments, despite being unavoidable.How centrifugal buoyancy affects the turbulent flow, including the heat transport, is still largely unknown, in particular, when it can be considered negligible.We study this problem by means of direct numerical simulations. Unlike in experiments, we are able to systematically vary the Froude number Fr (ratio of centrifugal to gravitational acceleration) and the Rossby number Ro (dimensionless rotation rate) independently, and even set each to zero exactly.We show that the centrifugal acceleration simultaneously leads to contending phenomena, e.g. reflected by an increase and a decrease of the center temperature, or a suppression and an enhancement of the heat transfer efficiency. Which one prevails as net effect strongly depends on the combination of Fr and Ro. Furthermore, we discuss implications for experiments of rapidly rotating convection.
机译：在快速旋转并加热不同的流体中，离心加速度在产生对流运动中可以起到与重力相似的作用。但是，在旋转Rayleigh-B'enard对流的范式系统中，尽管理论上不可避免，但离心浮力在理论研究中通常没有考虑，因此尽管不可避免，离心力在实验室实验中通常是不希望的。 ，尤其是在可以忽略不计的情况下，它仍然是很大程度上未知的。我们通过直接数值模拟研究了这个问题。与实验不同的是，我们能够独立地系统改变Froude数Fr（离心力与重力加速度的比）和Rossby数Ro（无量纲旋转速度），甚至将它们精确地设置为零，这表明离心加速度同时导致应对现象，例如中心温度的升高和降低，或者传热效率的抑制和提高反映了这一点。净效果主要取决于Fr和Ro的组合。此外，我们讨论了快速旋转对流实验的意义。

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